Interestingly this is still related to information: the fundamental thing which cannot travel faster than light is information, for example if I trace a circle in the sky with a laser pointer then the "dot" (when it eventually hits something) will be moving around a vast circle at far faster than light speed, but it cannot send information between the points on the circle so that's fine. Similarly, the effect of measurement ("collapsing the wavefunction") is just a propagation of information from inside the system to outside the system. Actually, it's an increase in the size of the system: first we have an atom that does or does not decay, then we have an atom that does decay and is detected or does not decay and is not detected. Then we have all that along with a vial of poison which is or is not broken. Then we have all that along with a cat that is alive or dead. Then we have a human who sees a living or dead cat. Then we have a paper which reports either a living or dead cat. Then we have a news report about the cat living or dying. And so on. Schroedinger's cat is always in an alive/dead superposition, but at some point that superposition expands (due to information flow) to include an Earth which is in a superposition of knowing it lived or died.
